Hierarchical image encryption based on cascaded iterative phase retrieval algorithm in the Fresnel domain
Hierarchical image encryption based on cascaded iterative phase retrieval algorithm in the Fresnel domain
复制标题
DOI：
10.1088/1464-4258/9/11/017
复制
发表时间：
2007-11
影响因子：
--
通讯作者：
X. Meng;L. Cai;Y. R. Wang;X. Yang;X. F. Xu;G. Dong;X. Shen;H. Zhang;X. C. Cheng
中科院分区：
文献类型：
--
作者：
X. Meng;L. Cai;Y. R. Wang;X. Yang;X. F. Xu;G. Dong;X. Shen;H. Zhang;X. C. Cheng
提出了一种新的基于迭代菲涅尔变换的级联多相位恢复的分级图像加密系统。该方法利用一系列级联在自由空间中的相位模板，在相应的层次中检索不同的目标隐藏图像。它可以在同一个系统中实现不同权限级别对秘密数据的不同级别访问，更高级别的权限可以访问更多的隐藏图像。该方法可以实现快速收敛和高质量的恢复图像，没有任何可识别的串扰噪声或失真，该系统的安全性进一步提高，通过使用一系列的补充密钥，如级联相位掩模的阶数和几何参数，除了所有的迭代相位掩模作为主密钥。通过计算机仿真验证和分析了该方法的可行性及其独特性。
A novel hierarchical image encryption system based on cascaded multiple-phase retrieval by an iterative Fresnel-transform algorithm is proposed. In this method a series of phase masks cascaded in free space is employed to retrieve different target hidden images in their corresponding hierarchical levels. It can realize different levels of accessibility to the secret data for different authority levels with the same system, and the higher level authority can get access to more hidden images. This approach can achieve fast convergence and high quality of the recovered images without any recognizable cross-talk noise or distortion, and the security level of this system is further enhanced by the use of a series of supplemental keys such as the orders of cascaded phase masks and the geometrical parameters in addition to all the iterated phase masks as principal keys. The feasibility of this method and its unique features are verified and analysed by computer simulations.